Thruhulls? We don't need no stinkin' thruhulls!

[hilbert]

Finished filling in the last of the thruhulls (2 cockpit scupper, 2 head, 2 transducers, 1 engine). Where possible, I followed West System's Guide on gluing in a center plug and repairing from both the inside and outside to avoid garbage can top size 12:1 bevels. I recommend becoming proficient on someones else's boat before doing this. Despite my usual slow learning curve, the repairs are better than they were before. Most of the sea cocks were only grabbing a few threads of the thru hull. For now, I will make do with 3 thruhulls, 2 for the cockpit scuppers and 1 for the engine cooling water. Not sure where they will go, except that I am sure that they will not go where they were. I'm considering putting the 3/4" engine raw water intake and filter down in the bilge and moving the seacocks from the scuppers aft out of the cabin (they take up space that I will need for future projects).


The holes from the head were the largest bevels, as access to the inside was blocked by a very thick liner.


These thruhulls would have been in the way of any efficient use of the space. By the way, the 1 1/4" valve connected to a 1 1/2" hose and scupper, with a reducing adapter. How much did CD save with this?

[K Chiswell]

I'm in the process of a similar project. I've gone from 8 thruhulls, including depth and speed, down to 3. Never had a problem with my seacocks so I don't know that it is worth it, but why have so many holes below the waterline. Fortunately my scuppers are already above the waterline. I will have a triducer (speed, depth and temp), head discharge and a common intake for all raw water needs.

[hilbert]

Fortunately my scuppers are already above the waterline. I will have a triducer (speed, depth and temp), head discharge and a common intake for all raw water needs.

I've looked at the Airmar SDT800 Triducer. Unfortunately, my hull deadrise is greater than the specified 22° maximum. Does the CD330 have a flatter bottom than the CD28 or how are you handling this?

Also, can you post any pictures that show the location of your scuppers above the water line. It might give me some inspiration for relocating mine.

Thanks,

[tjr818]

Fortunately my scuppers are already above the waterline. I will have a triducer (speed, depth and temp), head discharge and a common intake for all raw water needs.

I've looked at the Airmar SDT800 Triducer. Unfortunately, my hull deadrise is greater than the specified 22° maximum. Does the CD330 have a flatter bottom than the CD28 or how are you handling this?

Also, can you post any pictures that show the location of your scuppers above the water line. It might give me some inspiration for relocating mine.

Thanks,

We have the Triducer on Sláinte, our CD27. We had to angle it just a bit because the deadrise in the area was closer to 27°. I figure on a sailboat it shouldn't make much difference the boat is seldom level anyway. For life on the Mississippi we always have to allow an extra foot or two anyway. Even with only 4 foot of draft we have our shallow water alarm set for 8 feet.

[Russell]

I have seen a Nicholson 35 with above the waterline scuppers. The scupper drains in the cockpit were on the aft end, when to an elbow and hose strait aft with big (like 3") hose to exhaust style outlets on the transom with flapper covers to reduce the amount that came in durring a following sea. Seemed like a good idea to get rid of a couple of below waterline seacocks. But on a CD those hoses would be going through the lazarette and would have an effect on the storage area there.

[K Chiswell]

For my triducer the PO had already built up a bulb in front of the keel so it was easy to install vertically.



As for my scuppers they do go through the aft lazarette but they haven't caused me any issues. The setup on the 330 is similar to what Russell described, but I only have 1 1/2 inch lines. There is also a small well molded into the aft end of the cockpit that the drains are mounted in.





In this picture you can see where they exit the transom. My flappers are off because the boat is scheduled to be painted next week.

[hilbert]

Thanks for the pictures. Food for thought.
Are you happy with the built up bulb? Do you know its composition (thickened epoxy, fiberglass, both)?

[K Chiswell]

Yes I'm happy with it, it seems quite solid. I'm not sure what was used, but I know there was no glass in it. I ground about 3/8" of it off because my new thruhull was shorter than what came out.